Carburetor



- Apr. 3, 1923. 1,45%),628

J. M. FLANNERY GARB'JRETOR Filed App. "7, 1922 5 sheets-sheet l ATrap/v51.

Apr. 3, 1923.

J. M. FLANNERY CAR-BURETOR 5 sheets-sheet 2 Filed Apr.

Patented Apr. 3, 1923.

CARIBURETOR.

Application filed April 7,

To all. whom it ma concern Be it known that I. JOHN M. FLANNERY. acitizen of the United States, residing at Detroit, in the county ofW'ayne and State of Micl1igan,'have invented certain new and usefulImprovements in and-Relating to Ca.rburetors,' of which the following isa specification. p

- This invention relates to a carburetor for supplying carbureted air toan internal combustion motor.

One object of the invention is to provide a carburetor of relativelysimple construction. i t i I Anotherobject of the invention is toprovide acarburet'or which effects proper mixtures of air and gasolineat all times independently of the engine speed or increases therein,whereby efficient operation. rela-- tively quick pick-up' in speed andmaximum mileage is insured.

A further object of the invention is to provide an improved carburetorhaving a. plurality of mixing tubes and a. throttling means which is soarranged that it will.

throughout its range of movement from closed to full open position andback to closed position insure the flow of the conibustible charge fromeither or both mixing tubes to either side of the throttling means. sothat where a plurality of manifolds or av manifold having a plurality ofbranches are used, the mixture or charge flowing to each thereof will heof the same character.

Other objects of the inventioirivill be apparent to those skilled in-theart to which my invention relates from the following description takenin connection will the "accompanying drawings. wherein Fig. 1' is anelevation of a carburetor enibodying my invention Fig. 2 is alongitudinal section through the carburetor on theline 2--2 of Fig. 3.

Fig. 3 is a section on the line 3-4; of

Fig 1.

1g. 4 IS a section on the line 4-4 ot Fig. 1.

1922. Serial No. 550.493

Fig. is a section Figs. 4 and 6. p

Fig. 8 is a section on the line 88 of Fig. 3.

Fig. 8" is a fragmentary sectional view on the line Q.8" of Fig. 1. l

on the line 77 of Fig. 9 is a fragu'ientary'view on the line 99 of Fig.1, parts being broken away.

Fig. 10 is a perspective view of one ofv the levers; for operativelyconnecting the throttle valve and the supplemental valve.

Referring to the drawings, 1 indicates a chamber; comprising a bottomwall 2 and side walls 3, arranged to hold gasoline or other combustiblefluid and serve as a constant source of fuel supply for nozzles. 4, 5,to be later referred to. 6 indicates an air intake preferal'ilv oftubular shape in cross section. The air intake 6 may extendhorizontally. its side and lower walls being preferably formedintegrally with the bottom and sidewalls 2.3. of the fluid chamberl. 7indicates a web extending transversely between the side walls of the airintake 6 outer end a plug 12 having a head 13. The

fitting ll is 'lormcd with a duct 14 through which the fuel flows to thechamberl. The wall for the upper portion of the duct 14 is cut away toform a seat for a valve 15 which is preferably a needle valve. The stem16 of the valve li'fcxtends upwardly and. is guided'and operated in themanner to be later described. 17 indicates one or more ports formed inthe wall of the nipple 10 and opening at their inner ends into the duct14 therethrough. 18 indicates a coil pling member constructed forconnection with tlie'nipple 10. as shown. the coupling 19 (its over andsurrounds the nipple its side walls 19 being [)IQflfltlbl) shaped to 40the form a channel around the nipple to simulg taneously supply fluid toall of the ports 17. The coupling18 is formed with an Opening 20,through which the reduced end of the 5 plug 12 extends for connectionwith the inner wall of the nipple 10. When so connected, the head 13 ofthe plug 12 engages the coupling 18 and clamps it in position.

around the nipple and a ainst the bottom 10 wall 2. The plug 12 ispreferably boredout as shown at 21, a portion of such bore being screwthreaded to adjustably support a valvestem 22' in the bore. The stem 22is hollow and at its inner end itis formed with one or more laterallyextending ports 23, so that when the stem 22 ismoved inwardly by itsrotation, the ports will be positioned above the inner end of the plug12 and thereby permit draining of the'chamher l-and conduits leadingthereto.

coupling 18 is provided with a pipe section 18, to which a fuel supplypipe (not shown) is connected in a well known way.

The supply of the fuel to the chamber 1 'ispreferably controlled by afloat which may pomprisel a hollowmem'ber 24. The float 24 surrounds-thestem 16, being guided in' its up and dowiranovenients thereby. 25indicates a cover for" the chamber 1. The cover 9 may be held in placebya plurality of cap screws 26, secured an allgned {(ormed in lugs 27carried by the wall 3 and c ver 25. The central portion of the cover 25is formed with an opening 28 in whichthe upper end of the valve stem 16is slidably supported. 29 indicates an annular boss provided on thecover 25 and surrounding the guide opening-28. The outer wall of theboss 29 is screw threaded to permit connection therewith of a thimble 30which encloses but permits access to the upper end of the valve stem 16for reasons that will later appear. 31 indicates pair of spaced lugsdepending from the cover 25 and supporting between them, preferably atopposite sides of the stem 16, a pair of levers 32. The outer ends ofthe levers 32 engage the upper face of the float 24; the inner ends ofthe'levers are disposer. between and engage a pair of spaced collars 33and act therethrough to control the valve 16 due to rise and fall of thefloat 24. To permit of adjustment of the valve stem 16 relative to thefloat 24, whereby the fluid supply may be properly controlleihthe valvestem 16 is formed of two sections 16, 16 the latter being a sleevecarrying the collars 33 and adjustably fitting the section 16 andadapted to be fixed in its adjusted osition by a nut 16. By looseningthe nu 16 and engaging the slot in the free end of the sleeve 16 (afterthe removal of the thimble 30) with a suitable tool, the sleeve 16 maybe turned to adjust itlongitudi-,

nally of the section 16.

The connection 38 may '39, which is supported openings" leakage.

34 indicates a valve, preferably of the butter-fly type, disposed in theair intake or pipe 6 and movable oradjustable to open 'orclose thepassage through the intake a greater or lesser amount as conditions may7 require; more particularly the valve is operated to close the passagethrough the in-v take at the time of starting the motor. The valve 34 isfixed toa shaft 35, which is mounted at its opposite ends in bearings'01- openings formed in the: wall of the intake 6. At one end outside ofthe intake,- the shaft 35 is provided with a crank arm 36, which carriesat its free end a clamping device 37 to which an operating connection 838 is connected in any well known manner.

guided by a tube by a bracket 40 mounted on a boss 41 (see ig. 2)forming one bearing for the shaft 35.

I will-refer to the nozzle 4 as the main supply nozzle, as it will beapparent from the drawings and the following description that the mixingtube for the nozzle 4 con- .tinuously supplies carbureted air to. theengine or motor (not'shown) except as such supply may be regulated orcontrolled by a throttle 42; whereas, the mixing tube for the nozzle 5is normally closed and does not open to supply the carbureted air until05 the throttle 42 is opened'to or beyond a predetermined position, aswill be later set forth.

The nozzle 4 comprises a tubular member 43. Near. its upper end thetubular memher is reduced as shown at 43 and adjacent its reducedportion, its inner wall iscontracted, as shown at 44, thereby forming atthe lower end of the contracted portion a valve seat for a needle valve45 and above the contraction. portion a'cup shaped open end 4, fromwhich the gasoline is discharged.

The lower end of the tubular member "43 is provided with screw threads,as shown no 'to form a shoulder against Which the tu- 116 bular memberis tightened when its end 46 is positioned in the opening 47. 48 indi-,cates an opening formed in the bottom wall 2 in alignment with theopening 47; The wall of the opening 48 is screw threaded todetachably'receive a plug 49; the plug being provided with a collar 49,which is tightened against the wall 2 when the plug is positioned in theopening 48. 49 indicates a gasket interposed between the 001- lar 49?and the bottom wall 2 to prevent The plug 49 isformed with an opening 49in which the screw threaded portion of a stem 50 of the needle valve 45is adjustably supported. A gland 49 may be provided around the needlevalve stem 50 As shown, the valve stem 50 extends through the tubularmember 43 but is of such size as to permit the fuel to flow around itthrough the tubular member and through the orifice 44 when the valve isopen. At itslower end the stem 50 may be provided with arms 5O wherebyit may be readily turned.

51 indicates a tubular boss formed integrally with and extending fromthe upper face of the wall 8, and 'arranged to support-a tubular member54, which forms one of the elementscomprising the nozzle 5. As shown inthe drawings, the opening 48 and boss 51 are arranged so as to supportthe tubular members 43 and 54:, axially of the Venturi tubes, 52, 53, tobe later referred to, with which they are respectively associated. Atits upper end, the inner wall of the boss 51 is provided with screwthreads to engage and support the screw threaded lower end of thetubular member 54. The tubular member 54 extends upwardly, its upper endterminating in the Venturi tube 58 preferably at a point slightly abovethe upper discharge end of the nozzle 4. The wall of the boss 51 isthickened at its lower end to form a bottom wall 55, and such bottomwall. is formed with an opening 56, which leads through the wall. 8 intothe conduit 9. 57 indicates a supply tube having a' screw threadedportion 58 engaging the screw threads provided on the walls of theopeniug 56, whereby it is rigidly supported. The tube 57 extendsupwardly through the boss 51 and the tubular member 54, terminating inthe latter at a point below the gas level which is maintained in thenozzle 5 by the chamber 1. As shown, the supply tube 57 is smaller insize than the boss 51 and tubular member 54, so as to purpose to belater set forth.

provide around it an annular space 59 and a chamber 60 in the boss 51,in order that the fuel rising in the tube 57 may flow over its upper ordischarge end and through the space 59 irtothe chamber 60 for a end ofthe supply tube 57 is preferably enlarged to form a shoulder 61, whichis tightened against the under face of the wall 8. when the tube 57 ispositioned, the inlet end of the tube being shaped to form a seat for a.needle valve 62. 63 indicates an opening formed inthe bottom wall 2 inalignment with the opening 56. The wall of the opening 63 is screwthreaded to detachably receive a plug 64: the plug being provided with asuitable collar 65 which engages the wall 2 when the plug is positioned.66 indicates a gasket interposed between the collar 65 and wall 2 toprevent leakage. 67 indicates an opening formed in and extending throughthe plug 64, the wall of the The lower stem 62 of the needle valve 62,whreby the latter may be adjusted toward and from its seatto regulatethe supply of fuel to the tube 57.- A gland 68 may be provided aroundthe valve stem 62.

opening being provided with screw threads to engage screwthreadsprovided on the preferably terminate in a horizontal plane toform a seat for a conduit section indicated as an entirety at 69, and soshaped and arranged that the side wall 3 ofthe chamber forms an end wallfor the air intake 6' to direct 'the air upwardly and around the nozzles4, 5, and the nozzles l, 5, are disposed in a plane extendingdiametrically of the conduit section 69 so as to center'themwith respectto the Venturi tubes At their opposite sides, the intake 6 and section69 are provided with lugs 70 formed with aligned openings through whichsuitable cap screws 70 extend to secure the conduit section 69 to theair intake 6.

The conduit section69 is preferably a casting. The lower portion of thesection 69 is preferably elongated from side-to side and provided witha-transverse wall 69 arranged to form within said lower portion arelatively large mixing chamber 71 above the nozzle and a relativelysmall mixing chamber 72 above the nozzle 4, the chamber 72 constitutingthe main mixing chamber and the chamber 71 a supplemental or secondarymixing chamber. The upper portion of the casting is preferablycontracted to form a main cond lit 73 into which the carbureted air ,isdelivered: The conduit 7 3 is connected in any desired manner with theintake manifold of the motor. The flow or supply of the carbureted airfrom the conduit 73 to themanifold is controlled by the throttle 42.The-wall 69 is curved and co-operates with the-adjacent side and endwalls of the section 69 to form a seat for the upper portion of theVenturi tube 53 to support it concentric to the nozzle 74 indicates awallsen-tending across the lower end of the ch amber 72. The wall 74 ispreferably formed integrally with the adjacent end and side ,ivalls ofthe intake 6 and is shaped to cooperate with the lower end of the wall69 to close the chamber 72 at its lower end. "5 indicates an openingformed in the wall 74 concentr: to the nozzle l and serving as a seatfor the Yenturi tube 52. The Venturi tube 52 is preferably provided witha shoulder 52 which engages the upper face of the wall 74 so as tosupport the tube in the opening'75.

As shown in the drawings, the Venturi tubes 53, are of a size to insurethe dis- -zles as the air is drawn up through them.

nected to or formed integrally with the secchamber 72 through openings77 formed tion 69 and both Venturi tubes may be supported by either thesections 69 or intake 6.

76, 76 indicate valves foradmitting air from the intake 6directly intothe mixing in the wall 74 without passing through the .76 preferablycomprise balls which seat through a wide range of venturi andconstituting, in effect a bypass. The walls of the openings 77 areshaped to form seats for thevalves 76. i The valves themselves bygravity. Each ball 76 is lifted by the vacuum created by the engine andpermits air to pass to the mixing chamber 72, thereby preventing asrapid increase in suction effect as would take place. if the air intakewere of fixed area, and insuring sufficient air supply in-proportion tothe vacuum created to provide a proper'carbur'eting mixture with thegasoline being discharged from the nozzle 4.

The air primes through the by-pass' valves 76 with relatively greatvelocity, and acts uponthe carbureted air 'in or passing .through themixing chamber 72 to form a properly combustible change. By thisarrangement I am enabled to provide proper mixtures of fuel' for drivingoperations relatively low speeds with only the mixing tube 72 operating.As the opening of the valves 76 is controlled by the suction effectofthe engine they supply sufficient air for mixture with the carburetedair from the venturi- 52, to 'form t a properly mixed combustible chargein the mixing tube or chamber 7 2 accordingly as a larger quantity ofcarbureted air.is disch In the preferred form of the construction,Iprovide two valves 76 preferably disposed .between the Venturi tube 62and the wall tion to the suction effect at all 69 and at opposite sidesof a plane cutting the axes of the Venturi tubes 52 and 53. However,agreater or lesser number of valves may be provided, if desired. By thearrangement disclosed the sizes of each valve and valve seat n'iay berelatively small and more sensitive control may be effected in insuringthe admission of air in propor times: Furthermore, it will be seen thatI am enabled to maintain the correct supply of fuel while arged theretofrom the venturi.

1,4eo,eee

enough air at all times to insure a properly mixed combustible chargefor all running conditions, with resulting economical operation of theengine. As the balls are gravity operated, they are uneated at all timeswhen the suction effect eaches a predetermined degree. The balls 76 areguided by the Wall 69* and the walls of the section 69 and venturi 52 aswill be clear from Fig. 4;. The balls 76 are limited in their openingmovement by a rod' 79, preferably supported'at its opposite ends inrecesses '80 formed in the ends of a pair ofscrew plugs 81, fittingopenings formed in the side walls 6f the conduit section 69.

mixing it with charge end of the supplemental or secondary mixingchamberor tube 71. The valve 82 is open for the purpose to be later set forth,at which time airwill-be sucked in from the air intake 6 and the air inturn will draw fuel from the'jet 5 for mixing therewith. The valve 82 ispreferably of the butterfly type. It may be secured to a rock shaft 83.The shaft 83 is preferably-mounted at one end in a tubular boss 84formed on and extending laterally from one wall of the section 69; itsopposite end is mounted inan opening 85 formed inthe, metal whichconstitutes the wall 69 between the tubes 71, 72. The-shaft 83 extendsthrough the boss '84 and carries at its outer end a crank .86 by meansof which the valve 82 is operated. The hub of the crank 86 is preferablyformed with an annular recess to form a space around the shaft 83 for acoiled spring 87, one end of which may be secured to the crank and itsother end anchored to a pin 88, as shown inFi'g. 3'. The pin 88 mayserve .as a stop to limit the'movement of the crank 86 under theinfluence of the spring 87 when the valve 82 is in the closed position(see Fig. 1). The spring 87serves to maintain the valve 82 closed, butpermits it to be opened in the manner to be later described.

As shown, the throttle valve 42 is arranged to control the flow of thecarbureted air from the main mixing tube and also from the sup-.plemental or auxiliary mixing tube. I prefer to use a butterfly typeof'throttle to control the conduit 73. The throttle valve 42 ispreferably rigidly connected to a shaft 90- mounted at its opposite endsin the walls of the conduit-section 69, one end of the shaft beingextended and carrying at itsouter end a crank 91, whereby it may beoperated through suitable devices (not shown) in the usual manner-L Asshown, the shaft 90 extends transversely of the conduit; 73 and isdisposed in a plane which cuts the axes of the mixing tubes 71, 72 andnozzles 4, 5, therein? In such arrangement the throttle valve will.properly control the flovv 0f the carbureted air through the outletconduit operating, so that the same character of mixture will pass oneside of the valve 42 indicates a lug projecting from the wall of at anyinstant.

as passes the other side thereof. Accordingly, it will be seen thatwhere the conduit is con nected to a plurality of manifolds or amanifold which has a plurality of branches, the

same character of mixture will be supplied to each. Tlnsarrangement isparticularly advantageous where the mixing tubes have differentcapacities as herein disclosed. By

preference, both ends of the shaft 90 are extended and may carry crankseither or both of which may be utilized for operating the valve 42.Either or both cranks may be ad'- justably connected to the shaft 90topermit necessary take-ups and proper connection of the operatingdevices therewith. 92

the conduit section 69 and disposed in the path of movement of anelement, such as a screw, carried by a lug integrally connected with alever 94 (to be later referred to), whereby the movement of the valve 42is stopped at itsclosing position.

-.Means are provided for connecting the valves 42 and 82 together'foroperation in a predetermined relationship, whereby the latter ispositively operated by the ft rmer or through its operating means, to e1.ect a supply of carbureted air from the sipplemental or secondarymixing tube 71 when an auxiliary supply is needed and in quantities tomeet the requirements of the motor necting means comprises the followinginstrumentalities; the lever 94 (already referred to) which is keyed orotherwise secured to the shaft 90. The outer end of the lever 94 isformed with an. elongated slot-95. 96 indicates a link formed inits-upper end with an opening through which and the slot 95 a pin 97projects to pivotally connect the link 96 to the lever 94. The pin 97 isshaped to permit free pivoting of the link 96 and lever 94 as the latteris operated, but is adapted to be adjustably fixed to the lever .94- ateither end of the slot 95 or at any point between said ends, accordinglyas circumstances may require, .or reasons which will later be explained.At its lower end the link 96is provided with an elongated slot 98,through which projects a, pin 99 ,carried by the free end of the crank86, the pin 99 and slot 98 serving to pivotally and slidably connect thelink 96 to the erank 86. The pivot pin 99 is preferably headed so as toengage the link 96 at either side of the slot and maintain these partsin connected relationship. The positions of the innerend wall of theslot 95 relative to the shaft 90,

the inner end wall of the slot 98 relative The above referred to conmaybe desired or foundnecessary in the operation of the engine. The slot 95permits the necessary adjustment of the connections and the. resultantadjustment of the valves 42 and 82 relative to each other, whereby'efficient and economical operati n of the engine is effected.

100 indicates a supplemental gasoline well connected at its lower end bya duct .101 with the chamber 60. The well 100 and the duct 101 areformed in thickened portions of the walls forthe chamber 1 and airintake 6. The upper end of the well 100 is preferably enlarged andprovided with screw threads, whereby a plug or cap member 102 may beprovided to close the well. The plug may be formed with an air inletopening or duct 103 so that the gasoline in the well may be readilysupplied to the nozzle 5 by the suction effect of the engine.

As shown in the drawings, the supplemental well 100 is not connecteddirectly with the float chamber 1, but is connected to the supplementarynozzle 5 from which it is supplied, the gasoline overflowing the tube 57or passing directly through the port 57. In operation, where theauxiliary valve 82 is suddenly opened and the vacuum'of theengine causesa sudden and large intake of air to pass the nozzle and draw all of thefuel filling the nozzle 5, the well 100 serves to provide an immediateadditional supply of gasoline, sufficient to meet-the engine needs. Asthe gasoline well 100 is connected to the nozzle 5 and receivesits'supply therefrom, it will remain empty until the'valve 82 is closed,whereupon it will refill in the manner already described. The well 100is of a size to hold a suiiici'ent supply of gasoline to provide anample charge of fuel from the nozzle 5 in the event the throttle 42 andvalve 82 are opened to full open position; hence such supply will pro-\ide the necessary fuel to insure a quick pick-up in engine speed to thefull limit of speed of the latter, if desired.

' In the construction herein described, I provide a carburetor in whichthe air and gasoline are supplied in proper quantities at all times, sothat theen ine maybe properly controlled to run on high, low andintermediate speeds, and effect relatively quick changes in speeds. Byproviding a I main mixing tube, a supplemental mixing tube, and by-passvalves for automatically supplying air from the air intake to the mixingchamber, I am enabled to provide proper mixtures at a l times, and to soreduce the vacuum effect on either or both noz'zles that .at no timewill there be a failure of gasoline supply.

In my construction of carburetor it will be noted that I provide arelatively small mixing tube which is always openand. a relatively largemixing tube which is normally closed but is caused to supply atomizedfuel in correlation to the operation of the throttle whereby ample fuelis supplied as the speed of the engine increases. In such a constructionthe fuel supply is in proportion to the demands of the engine, beingautomatically supplied and shut off as the speed of the latterincreasesand decreases. This arrangement therefore provides relatively greatflexibility in driving where the carburetor is associated with anautomobile.

By providing two mixin tubes one of which augments the-other, tie mainmixin tube is not called upon to supply all of the the fuel required asthe. engine speeds up; hence when the engine speed increases the fuelsupplied is augmentedby the supple- 'mental mixing tube 71, both tubes71, 72,

then supplying the required fuel. Accordingly I am enabled to operatethe engine over a wide range of speedsand maintain at all times an amplesupply of carbureted an.

It will be evident that many modifications of the apparatus can be madewithout interfering with the functions of the same or affecting theresults accomplished; hence I wish to be understood that my disclosuresand the description herein are purely illustrative and are not intendedto be in any sense limiting, as widely differing einbodiments andapplications of the invention will suggest themselves to those skilledin the art to which my invention relates without departing from thespirit and scope thereof as defined by the appended claims.

What I claim is:

1. In a carburetor, the combination of a supply chamber, an air intake,an outlet conduit, a pair of mixing tubes each com municating with saidintake and said conduit, a nozzle disposed in each said mixing tubeconnected with said chamber, a throttle for controlling the flow ofcarbureted air through said conduit, a valve for contiol ling the flowof carbureted air from one of said mixing tubes into said conduit, meansfor operating said throttle and said valve, and a valve mechanism foradmitting air into one of said tubes independently of said communicationof the latter tube with said intake.

'2. In a carburetor, the combination of a supply chamber, an, airintake, an outlet conduit, a pair of mixing tubes each communicatingwith said intake and said conduit, a nozzle and a venturi-disposed ineach,

said mixing tube, each venturi being open at its lower end to receiveair from said intake and each nozzle being connectedwith said chamber, athrottle for controlling the flow of carbureted air through saidconduit, a valve for controlling the flow of carbureted air from one ofsaid mixing tubes into said conduit, means for operating said throttleand said valve, and a valve mechanism for admittin air from said intakeinto one of said mixing tubes around the nozzle and venturi openingthereinto.

3. In a carburetor, the combination of a supply chamber, an air intake,an outlet conduit, :1 pair of mixing tubes each com municating with saidintake and said con duit, a nozzle and a venturi disposed in 'each saidmixmgtube, each venturi being open at its lower end to receive air fromsaid intake and each nozzle being connected with said chamber, athrottle for controlling the flow of car-bureted air through saidconduit,

va valve for controlling the flow of carbureted air from one of saidmixing tubes into said conduit, means for operating said throttle andsaid valve, and a valve mechanism for admitting air from said intakeinto one of said mixing tubesL-around the nozzle and venturi leadingthereinto, the valve element for'said valve mechanism comprising amember which is ravity seated and operated to open thevalve when thevacuum is sufficient to overcome its weight.

4. In a carburetor, the combination of a gasoline supply chamber, an airintake, an outlet eonduit, a pair of mixing tubes each communicatingwith said intake and said conduit, a nozzle disposed in each of saidmixing tubes connected with said chamber,

a valve for controlling the How of carbureted air through said conduit,a valve for controlling the flow of carbureted-air from. one of saidmixing tubes into said conduit, operating connect-ions between saidvalves, means for operating one of said valves, and a valve mechanismfor admitting air from said intake into one of said tubes independentlyof said communication between the latter tube with said intake.

5.. In. a carburetor, the combination of a gasoline supply chamber, anair intake, an

outlet conduit 21 pair of mixing tubes each communicating with saidintake and said conduit, a nozzle and a venturi disposed in each of saidmixing tubes, each venturi be ing open atits lo'vver end to receive airfrom said intake and each nozzle being connected with said chamber, avalve for controlling flow of carbureted air through said conduitfavalve for controlling the flow of mixed carbureted air from one of saidmixing tubes into said conduit, operating connections between saidvalves, means for op erating one of said valves, and a valve mechanismfor admitting air from said intake into the other mixing tube around thenozzle and venturi opening thereinto.

6. In a carburetor, the combination of a supply chamber, an airintake,an outlet conduit, a pair of mixing tubes each communicating with saidconduit, a nozzle disposed in each said mixing tube connected with saidchamber, a venturi. mounted in one of said tubes and surrounding thenozzle disposedtherein, a wall extending tr versely across the othertube and formed with a plurality of openings, the wall of one of whichis concentric to the nozzle disposed in said tube, a vent-uri supportedin said last mentioned opening in said transversely extending wall, athrottle for con? trolling the flow of carbureted air through saidoutlet, means for operating said throttle, a valve for controlling theflow of carbureted air from one of said mixing tubes into said conduit,means for positively operating said valve, and a valve tor the otheropening in said wall tor'admitting airv from the intake through saidopening into the adjacent mixing tube.

7. In acarburetor, the combination ot'a fuel supply chamber, an airintake, an outlet conduit, a pair of mixing tubes each com municatingwith said intake and said conduit, a nozzle disposed in each of saidInixing tubes and connected with said chamber, one of said nozzlescomprisinginner and outer concentrically arranged tubes, the inner oneof which is connected to said chamber, said inner tube terminating at apoint below the level of the fuel to permit the fuel to over flow intothe outer tube, a valve for controlling the flow of -arbureted airthrough said conduit, 21 valve for controlling the flow of carburetedair from one of said mixing tubes into said conduit, operatingconnections between said valves, means for operatingone of said valves,a supplemental vented fuel well, and a connection betweenthe lower endof said well and said outer nozzle tube through which said. well isfilled and emptied.

' 8. In a carburetor, the combination of a fuel supply chamber. an airintake, main and secondary mixing tubes each communicating with saidintake, an outlet conduit into which said tubes open, a nozzle disposedin each said mixing tube connected with said chamher. a venturisurrounding the nozzle in said main mixing tube, a throttle forcontrolling the flow of carbureted air through said con duit, a valvefor controlling the flow of carbureted air from said secondary mixingtube into said conduit, means for operating said throttle and saidvalve, and means responsive o fluid pressure for supplying a variablequantity of air from the intake. around'the nozzle and the venturi insaid main mixingtube.

9. In a carburetor thecombination of a wit said chamber, a venturi'inone of said tubes, a gravity seated air valve in the mix ing tube havingsaid venturi therein and torminga by-pass therearound from said intake,and a-valve for con itolling the flow of carbureted air from, the otherof said tubes into said conduit.

10. In a carburetor, the combination with a fuel suppiy chamber, of arelatively small mixing tube having a fuel nozzle for low speedoperations, a relatively large mixing tube having a fuel nozzle, saidrelatively large mixing tube being supplemental to and co-ordinat'edwith said first-inentioned mixing tube for higher speed. operations, anair intake, means for admitting air from. said intake to said mixingtubes, an outlet to which both said mixing tubes are connected, valvesfor said outlet and said supplemental mixing tube, and mechanism foradmitting ir to said relatively smallmixing tube independently of saidfirst mentioned air admitting means. 1, 11. In a carburetor, thecombination wit a fuel supply chamber, of arelatively smallmixing tubehaving a nozzle connected to said chamber for low speed operations, arelatively large mixing tube having a nozzle con nected to said chamber,said relatively large mixing tube being supplemental to and coordinatedwith said first mentioned mixing tube for higher speed operations, anair intake, means for admitting air from said intake to said mixingtubes, an outletto which i both said mixing tubes are connected, valvesfor controlling vin co-ordinated relationship the How of carbureted airthrouglrsaid outlet and from said relatively large mixing tube to saidoutlet, and a valve mechanism for admitting air to said relatively smallmixing tube independently of the above said chamber and a venturitherein for low speed operations, a relatively large mixing tube havinga nozzle connected to said chamber, said relatively large mixing tubebeing supplemental to and coordinated with said first mentioned mixingtube for higher speed operations, an air intake for admitting air tosaid venturi and the relatively large mixing tube, an outlet t whichboth said mixing tubes are connected, valves for controllin inco-ordinated relationshi the flow of carbureted air through said out etand from said relatively large mixing tube to said out: let, and a valvemechanismfor admitting air from said intake around said venturi intosaidrelatively small mixing tube.

13; In a carburetor, the combination of a mixing tube of relativelysmall capacity having a fuel. nozzle arranged to supply carbu-reted airfor'ordinary' driving speeds, a mixing tube of relatively large capacityhaving a fuel nozzle, said relatively large mixing tubebeingco-ordinated with said first mentioned-mixing tube to supplycarbureted air supplemental to that supplied thereby for higher drivingspeeds, an outlet to which said mixing tubes are connected, means forsupplying fuel to said nozzles, a valve for controlling the flow ofcarbureted-air from said relativel large mixing tube, means forcontrolling t e flow of carbureted air from said tubes through saidoutlet, said control means being disposed and arranged to permitsubstantially equal portions of the combustible mixture to pass toeither side thereof when either the mixing tube of relatively smallcapacity or both mixing tubes are supplying carbureted air to saidoutlet, and connections between said control means "and said valve,

whereby the latter is positively operated.

, 14. In a carburetor, the combination of a mixing tube of relativelysmall capacity, having a fuel nozzle arranged to supply carbureted airfor ordinary driving speeds, a

, mixing tube of relatively large capacity having a fuel nozzle saidrelatively large mixing tube being co-ordinated w1th sa1d firstmentioned mixing tube to supply carbureted an' supplemental to thatsupplied thereby for said mixing tubes communicate and a butterhigherdriving speeds, an outlet to which said mixing tubes are connected,means for su )l in fuel to said nozzle means for ad- 1 7 mitting air tosaid mixing tubes, means for admitting air to said mixing tube ofrelatively small capacity independently of said first mentioned airadmitting means, and means for controlling the fiow of carbureted airfrom said tubes through said outlet, said control means being disposedandarranged to permit portions of the combustible mixture to pass toeither side thereiif from said mixing tubes when either the mixing tubeof relatively small capacity or both mixing tubes aresupplyingcarbureted air to said outlet.

15. In a carburetor, the combination of a fuel supply chamber, a pair ofmixing tubes each having a nozzle therein connected to said chamber, anair intake for supplying air to said tubes, an outlet conduit with which'tly valve mounted to rotate in said conduit about an axis extendingtransversely thereof and disposed in a plane cutting the axes of saidnozzles, a devicefor controlling the How of carbureted air from one pfsaid mixing tubes to said'outlet conduit, and connections between saidvalve and said device, whereby the latteris positively operated.

16. In a carburetor, th'e combination of a fuel supply chamber, a pairof mixing tubes each having a nozzle therein connected to said chamber,an air intake for supplying air to said tubes, an outlet conduit withwhich said mixing tubes communicate, a butterfly valve mounted to rotatein said conduit about an axis extending transversely thereof anddisposed in a plane cutting the axes of said nozzles, and valve devicesdisposed upon opposite sides of said plane for admitting air into one ofsaid mixing tubes.

17. In a carburetor, the combination of an air intake, a chamber forsupplyingfuel, a pair of mixing chambers each having a venturiincommunication with said intake and a nozzle connected to said supplychamber, an outlet conduit with which said mix-.

ing chambers communicate, a butterfly valve transversely thereof anddisposed in a plane cutting the axes of said nozzles, a wall for closingthe lower end of one of said chambers around the ventu'ri therein, saidwall being formed with an opening, and a valve device normally closingsaid opening and arranged to admit air from said intake into saidchamber around the venturi therein.

18. In a carburetor, the combination of an air intake, a chamber forsupplying fuel, a pair of mixing chambers arranged side by side parallelto eachother, each including a venturi having communication with saidintake and an axially arranged nozzle connected to said supply chamber,an outlet conduit with which said mixing chambers communicate, abutterfly throttle valve in said conduit secured to a shaft extendingtransversely thereof and disposed in a plane cutting the axcs of saidnozzles, a wall for closing the lower end of one of said mixing chambersaround the venturi therein, said wall being formed with an opening, avalve device normally closing said opening and arranged to admit airfrom said intake around said venturi into the adjacent mixing chamber, avalve for controlling the flow of carbureted air from the other mixingchamber, and connections between said throttle valve and said lastmentioned valve arranged to operate the latter after said throttle valvZ5 said fuel chamber, means controlling the acling the admission of airto oneof said mix,- ing tubes under different operatlng condit1ons,a fue'l chamber, fuel inlet means in each mlxmg tube and communicating withconditions of operation.

tion of said mixing tubes so that said tubes signed my name. are broughtinto action successively, and

JOHN M. FLANNERY.

means controlling the flow through said mixture outlet arranged todivide the mixture passing therethrough in equal parts under all Intestimony whereof, I have hereunto

